In order to invite candidates or invite yourself to an Assessment or Reference Check, you first been to verify your email address.
At the top of the HiPeople app, you'll see a banner like the one below asking you to verify your email address:
Simply click the "Click here to send it again" button, check your email inbox for an email from us and follow the instructions in the email.
You should then be able to invite candidates/ invite yourself.
If you're still struggling with this, please reach out to support@hipeople.io